To realise pronoun as "one"? (8)
I believe the answer is:
together
'as one?' is the definition.
(I've seen this before)
'to realise pronoun' is the wordplay.
'realise' becomes 'get' (I've seen this in another clue).
'pronoun' becomes 'her' (I've seen this before).
'to'+'get'+'her'='TOGETHER'
(Other definitions for together that I've seen before include "stable" , "in concert" , "In unison" , "In company or in conjunction" , "In each other's company" .)