They haven't even a couple of children to tutor (5)
I believe the answer is:
teach
'tutor' is the definition.
(I've seen this before)
'they haven't even a couple of children' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'children' could be 'ch' (genealogical abbreviation) and 'ch' is found within the answer.
The remaining letters 'te' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for teach that I've seen before include "Tutor" , "Cheat (anag)" , "Coach" , "Work with pupils" , "show" .)