Metal drummers? (5,4)
I believe the answer is:
steel band
'metal drummers?' is the definition.
'steel band' can be an answer for 'drummers?' (I've seen this before). I'm unsure of the 'metal' bit.
'metal drummers?' is the wordplay.
'metal' becomes 'steel' (steel is a metal alloy).
'drummers?' becomes 'band' (I can't justify this - if you can you should believe this answer much more).
'steel'+'band'='STEEL BAND'
Can you help me to learn more?
(Other definitions for steel band that I've seen before include "Caribbean ensemble" , "Caribbean musicians" , "Musicians playing oil drums" , "drummers" , "(Players of) improvised drums" .)