Narrow part of delta, perhaps (5)

I believe the answer is:

taper

'narrow' is the definition.
(I've seen this before)

'part of delta perhaps' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'TAPER' is hidden within 'delta perhaps'.

(Other definitions for taper that I've seen before include "Thin progressively" , "Become thinner - lighter" , "Diminish gradually" , "Get more slender" , "Slender candle" .)

I've seen this clue in The Telegraph.

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