Crossword Genius

After competition's opening, enter jam (4)

Ross

I believe the answer is:

clog

'jam' is the definition.
(clogging is a kind of jamming)

'after competition's opening enter' is the wordplay.
'after' is a charade indicator (letters next to each other).
'opening' indicates taking the first letters.
'enter' becomes 'log' (logging is a kind of entering).
The initial letter of 'competitions' is 'c'.
'c' next to 'log' is 'CLOG'.

(Other definitions for clog that I've seen before include "Footwear - hamper" , "Shoe with a thick wooden sole" , "Dutch shoe" , "Wooden footwear" , "Block up - type of shoe" .)

I've seen this clue in The Independent.
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