Dance record slows in middle (5)
I believe the answer is:
disco
'dance' is the definition.
(I've seen this before)
'record slows in middle' is the wordplay.
'record' becomes 'disc' (synonyms).
'in middle' indicates the central letters.
The central letter of 'slows' is 'o'.
'disc'+'o'='DISCO'
(Other definitions for disco that I've seen before include "Demonic spirit" , "equipment for playing recordings" , "Style of pop music" , "Modern dancehall of youth" , "Musical party" .)