Our team may keep one piano clean (4)
I believe the answer is:
wipe
'clean' is the definition.
(wipe can mean to clean something down)
'our team may keep one piano' is the wordplay.
'our team' becomes 'we' ('we' would make up 'our' team).
'may keep' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'piano' becomes 'p' (musical abbreviation).
'i'+'p'='ip'
'we' going around 'ip' is 'WIPE'.
(Other definitions for wipe that I've seen before include "Swab" , "Erase recording" , "Clean (a surface)" , "Clean with a damp cloth" , "use cloth" .)