Volunteers to go round some current resort (5)
I believe the answer is:
tampa
'resort' is the definition.
(I have seen 'American resort' mean 'tampa' so perhaps 'resort' could also mean 'tampa')
'volunteers to go round some current' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'to go round' indicates putting letters inside.
'some current' becomes 'amp' (unit of electrical current).
'ta' enclosing 'amp' is 'TAMPA'.
(Other definitions for tampa that I've seen before include "US city" , "City in Florida" , "Port of western Florida" , "American resort" , "Floridian resort" .)