Gripped by dysentery? Join the competition! (5)

I believe the answer is:

enter

'join the competition' is the definition.
(I've seen this in another clue)

'gripped by dysentery?' is the wordplay.
'gripped by' says the answer is hidden in the clue.
'ENTER' can be found hidden inside 'dysentery'.

(Other definitions for enter that I've seen before include "Record - stage direction - come in" , "Record (in a log)" , "submit?" , "Move into" , "put in for a race" .)

I've seen this clue in The Guardian.

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