Repaired marble, cutting line for resin (5)
I believe the answer is:
amber
'for resin' is the definition.
(amber is a type of resin)
'repaired marble cutting line' is the wordplay.
'repaired' is an anagram indicator.
'cutting' suggests deleting specific letters.
'line' becomes 'l' (used when specifying particular lines from a poem).
'marble' with 'l' taken out is 'marbe'.
'marbe' anagrammed gives 'AMBER'.
(Other definitions for amber that I've seen before include "Yellow fossil-resin" , "Honey-yellow colour" , "Stone" , "Neither red nor green?" , "Road warning" .)