A suggestion can get detailed (5)
I believe the answer is:
tinge
'a suggestion' is the definition.
(I've seen this before)
'can get detailed' is the wordplay.
'can' becomes 'tin' ('tin' can be a synonym of 'can'**).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'get' with its final letter removed is 'ge'.
'tin'+'ge'='TINGE'
(Other definitions for tinge that I've seen before include "show a bit of colour ?" , "Slight amount of colour" , "Suffuse" , "Colour slightly; trace" , "Smattering" .)