Help son to cut curly hair, with regret (6,2)

'regret' is the definition.
I know nothing about this answer so I can't tell whether this works.

'help son to cut curly hair' is the wordplay.
I cannot quite understand how this works, but
'help' could be 'aid' (synonyms) and 'aid' is present in the answer.
'son' could be 's' (genealogical abbreviation for son) and 's' is found in the answer.
'hair' could be 'afro' (afro is a kind of hair) and 'afro' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'with' acts as a link.

Can you help me to learn more?