Pierce tin? It's tricky -- I'll get something (9)
I believe the answer is:
recipient
'i'll get something' is the definition.
(a recipient receives something)
'pierce tin? it's tricky' is the wordplay.
'it's tricky' indicates an anagram.
'pierce'+'tin'='piercetin'
'piercetin' with letters rearranged gives 'RECIPIENT'.
(Other definitions for recipient that I've seen before include "relatively unblessed type" , "Someone getting" , "Receiver" , "One who's given" , "One taking delivery" .)