Think about a child (6)

I believe the answer is:

reason

'think' is the definition.
(reasoning is a kind of thinking)

'about a child' is the wordplay.
'about' becomes 're' (regarding).
'child' becomes 'son' (son is a kind of child**).
're'+'a'+'son'='REASON'

(Other definitions for reason that I've seen before include "Capacity for rational thought" , "Justification; sanity" , "Logic of senora" , "Mental power to justify an act" , "Sanity of senora" .)

I've seen this clue in The Times.

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