Pine or ivory twin heads on taps? (4)
I believe the answer is:
itch
'pine' is the definition.
(thesaurus)
'ivory twin heads on taps?' is the wordplay.
'heads' indicates taking the first letters.
'on' says to put letters next to each other.
'taps?' becomes 'ch' (I've seen this in other clues).
The first letters of 'ivory twin' is 'it'.
'it'+'ch'='ITCH'
'or' is the link.
(Other definitions for itch that I've seen before include "following seven years in union?" , "longing for something" , "Constant desire" , "Irritate" , "Irritating pain" .)