Look after father; some spinach will perk him up (6)
I believe the answer is:
popeye
'some spinach will perk him up' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'look after father' is the wordplay.
'look' becomes 'eye' (eyeing is a kind of looking).
'after' is a charade indicator (letters next to each other).
'father' becomes 'pop' (pop is a kind of father).
'eye' after 'pop' is 'POPEYE'.
Can you help me to learn more?
(Other definitions for popeye that I've seen before include "Spinach-eating sailor" , "Cartoon spinach eater" , "I eat spinach" , "Spinach and Olive Oyl lover" , "Bluto's rival" .)