Weak, taking a note between two points (3)
I believe the answer is:
wan
'weak' is the definition.
(similar in meaning)
'a note between two points' is the wordplay.
'two points' can mean two substitutions for 'point'.
'a note' becomes 'a' (musical note).
'between' is an insertion indicator.
'point' becomes 'W' (West).
'point' becomes 'n' (North).
'w'+'n'='wn'
'a' inserted within 'wn' is 'WAN'.
'taking' acts as a link.
(Other definitions for wan that I've seen before include "Pale and looking ill" , "Direly pale" , "Looking pale and sickly" , "Pasty" , "Pale and weak-looking" .)