Old railwaymen given points to look after (5)
I believe the answer is:
nurse
'look after' is the definition.
(thesaurus)
'old railwaymen given points' is the wordplay.
'old railwaymen' becomes 'nur' (National Union of Railwaymen).
'given' means one lot of letters go next to another.
'points' becomes 'se'.
'nur'+'se'='NURSE'
'to' acts as a link.
(Other definitions for nurse that I've seen before include "Hospital carer" , "Feed" , "Qualified carer" , "Look after the sick" , "Care for - harbour" .)