Remorse of GI after pinching uniform left just outside (5)
I believe the answer is:
guilt
'remorse' is the definition.
(guilt is a kind of remorse)
'gi after pinching uniform left just outside' is the wordplay.
'after pinching' means one lot of letters goes inside another.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'just outside' says to hollow out the word (remove centre letters) (just the outside letters of the word).
'left' with its centre taken out is 'lt'.
'gi' going around 'u' is 'gui'.
'gui'+'lt'='GUILT'
'of' acts as a link.
(Other definitions for guilt that I've seen before include "(Shame for) criminality" , "Responsibility for criminal offence" , "(Shame from) having done wrong" , "Sin" , "Feeling of culpability" .)