Wobbly tum bared to reveal tattoo (8)
I believe the answer is:
drumbeat
'tattoo' is the definition.
(thesaurus)
'wobbly tum bared' is the wordplay.
'wobbly' indicates an anagram (I've seen this in other clues).
'tum'+'bared'='tumbared'
'tumbared' is an anagram of 'DRUMBEAT'.
'to reveal' is the link.
(Other definitions for drumbeat that I've seen before include "That'll get you dancing!" , "Rataplan" , "Sound of common percussion instrument" , "rhythmic sound!" , "Thumping" .)