Pledged to have shelf (5)

I believe the answer is:

ledge

'shelf' is the definition.
(I know that shelf can be written as ledge)

'pledged to have' is the wordplay.
'to have' indicates a hidden word.
'LEDGE' can be found hidden inside 'pledged'.

(Other definitions for ledge that I've seen before include "Sill" , "Mantelpiece" , "Shelf-life projection" , "Ridge or shelf" , "Projecting ridge on a mountain" .)

I've seen this clue in The Mirror.

Want a hint initially instead of a full solution? Install my app