Foster sister? (5)

I believe the answer is:

nurse

I believe this clue is a double definition.

'foster' is the first definition.
(thesaurus)

'sister?' is the second definition.
(thesaurus)

(Other definitions for nurse that I've seen before include "Sister, e.g." , "Look after: entertain" , "Care for the sick" , "Carry on - - (film)" , "Hospital tender" .)

I've seen this clue in The Telegraph.

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