In Pilgrim's Progress, a child (5)

I believe the answer is:

sprog

'child' is the definition.
(informal term for a child)

'in pilgrim's progress a' is the wordplay.
'in' says the answer is hidden in the clue.
'SPROG' can be found hidden inside 'pilgrims progress a'.

(Other definitions for sprog that I've seen before include "Kid" , "Baby (slang)" , "little one" , "Child, colloquially" , "Infant" .)

I've seen this clue in the Evening Standard.

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