Liable to be the wrong tap (3)
I believe the answer is:
apt
'liable' is the definition.
(I've seen this before)
'the wrong tap' is the wordplay.
'the wrong' is an anagram indicator.
'tap' is an anagram of 'APT'.
'to be' is the link.
(Other definitions for apt that I've seen before include "Tap (anag.)" , "apartment in Queens, say" , "suitable for the circumstances" , "Apposite, appropriate" , "Suitable; quick to learn" .)