Be quiet gently going round edge in bright pink (6)
I believe the answer is:
shrimp
'bright pink' is the definition.
(shade of pink)
'be quiet gently going round edge' is the wordplay.
'be quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'gently' becomes 'p' (musical abbreviation for 'piano', softly).
'going round' indicates putting letters inside (some letters go around others).
'edge' becomes 'rim' (rim is a kind of edge).
'sh'+'p'='shp'
'shp' placed around 'rim' is 'SHRIMP'.
'in' is the link.
(Other definitions for shrimp that I've seen before include "who gets bullied?" , "School member" , "Tot" , "Diminutive person" , "Small edible shellfish, pink when boiled" .)