Small person in Cold War fiction (5)
I believe the answer is:
dwarf
'small person' is the definition.
(dwarf is a kind of small person)
'in cold war fiction' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DWARF' can be found hidden inside 'cold war fiction'.
(Other definitions for dwarf that I've seen before include "Small person or star" , "Small mythical creature" , "Make seem small" , "Dopey, perhaps?" , "Midget" .)