Crossword Genius

Sudden rush, after wasting time, to be prompt (4)

Ross

I believe the answer is:

spur

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

'sudden rush after wasting time' is the wordplay.
'sudden rush' becomes 'spurt' (a spurt is a sudden burst or jet).
'after wasting' suggests deleting specific letters.
'time' becomes 't' (abbreviation).
'spurt' with 't' removed is 'SPUR'.

'to' acts as a link.

(Other definitions for spur that I've seen before include "Sharply pointed projection" , "outcrop" , "railway siding" , "'Urge, goad (4)'" , "Goad; stimulus" .)

I've seen this clue in The Times.
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