Battered fish and Tango for workers (5)
I believe the answer is:
shift
'workers' is the definition.
(I've seen this before)
'battered fish and tango' is the wordplay.
'battered' is an anagram indicator.
'and' says to put letters next to each other.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'fish' anagrammed gives 'shif'.
'shif'+'t'='SHIFT'
'for' acts as a link.
(Other definitions for shift that I've seen before include "Change location" , "Change - period of work" , "Move; loose dress" , "Time when group of people are working" , "Change (gear); dress" .)