Why doesn't 'clear' fit here?

English as a Second Language English Teacher Explanations (ESL Tests)
1

English Language Tests, Intermediate level

ESL/EFL Test #69 [color=blue]“How to compliment”, question 6

I honestly can’t believe that you are … enough to have such grown up children.

(a) wise
(b) old
(c) grown
(d) clear

English Language Tests, Intermediate level

ESL/EFL Test #69 [color=blue]“How to compliment”, answer 6

I honestly can’t believe that you are old enough to have such grown up children.

Correct answer: (b) old

Your answer was: [color=red]incorrect
I honestly can’t believe that you are clear enough to have such grown up children.
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Hi Teachers,

Why doesn’t ‘clear’ fit here?

Thank you.

2

It just makes no sense to me, Watie. What do you think ‘clear enough to have grown children’ could mean?

3

Please, my apologize to you…
Sorry, I had read in different meaning and I knew I was wrong. I read ‘have such grown’ as present perfect (It is clear that she has grown up from children to become a man.) and ‘to have grown children’ means possessive (having a children) instead. :wink:

4

That’s right.