Isn't able to put a girl to bed (6)
I believe the answer is:
cannot
'isn't able' is the definition.
I can't tell whether this definition defines the answer.
'put a girl to bed' is the wordplay.
'put' is an insertion indicator.
'a girl' becomes 'ann' (woman's name).
'to bed' becomes 'cot' (cot is a type of bed).
'ann' inserted into 'cot' is 'CANNOT'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for cannot that I've seen before include "Defeatist's word?" , "Is not able to" , "Is unable to" , "Is not in a position to" , "Canton (anag.)" .)