Thanks solitary copper, with claws! (7)
I believe the answer is:
taloned
'with claws' is the definition.
(I've seen this before)
'thanks solitary copper' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'solitary' becomes 'lone' (synonyms).
'copper' becomes 'd'.
'ta'+'lone'+'d'='TALONED'
(Other definitions for taloned that I've seen before include "with pincers" , "with nippers?" , "ability to maintain a firm grasp?" , "Hawk being so" , "Clawed" .)