Missing first couple of signals before reversing leads to vulgarism! (5)
I believe the answer is:
slang
'to vulgarism' is the definition.
(thesaurus)
'missing first couple of signals before reversing leads' is the wordplay.
'SLANG' is hidden back-to-front in amongst the letters.
But, I'm uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for slang that I've seen before include "Any class's jargon" , "See 15" , "abuse" , "Non-standard vocabulary" , "type of language?" .)