Crossword Genius

Sudden energy after I am timed swimming (9)

Ross

I believe the answer is:

immediate

'sudden' is the definition.
(thesaurus)

'energy after i am timed swimming' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'after' is a charade indicator (letters next to each other).
'swimming' is an anagram indicator.
'am'+'timed'='amtimed'
'amtimed' anagrammed gives 'mmediat'.
'i'+'mmediat'='immediat'
'e' after 'immediat' is 'IMMEDIATE'.

(Other definitions for immediate that I've seen before include "Instantaneous" , "Involving no delay" , "Nearest" , "Direct" , "Prompt,straightaway" .)

I've seen this clue in The Telegraph.
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