Jumpy fellow given food outside (6)
I believe the answer is:
frayed
'jumpy' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?
'fellow given food outside' is the wordplay.
'fellow' becomes 'ray' (man's name).
'given food' becomes 'fed' (I've seen this before).
'outside' means one lot of letters goes inside another.
'ray' inserted within 'fed' is 'FRAYED'.
Can you help me to learn more?
(Other definitions for frayed that I've seen before include "Tattered and threadbare" , "Became strained" , "Threadbare and worn" , "Worn away at the edges" , "Well worn with loose threads" .)