Let's deal with flyaway hair (6)
I believe the answer is:
permit
'let's' is the definition.
(synonyms)
'deal with flyaway hair' is the wordplay.
I cannot really understand how this works, but
'hair' could be 'perm' (perm is a kind of hair) and 'perm' is found within the answer.
The remaining letters 'it' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for permit that I've seen before include "Allow; make possible" , "Let; enabling document" , "Licence -- license" , "Let - pass" , "Official document giving authorisation" .)