An annoying thing to do in April, especially (4)

I believe the answer is:

rile

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'an annoying thing to do' is the definition.
I can't tell whether this definition defines the answer.

'in april especially' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RILE' is hidden within 'april especially'.

Can you help me to learn more?

(Other definitions for rile that I've seen before include "Get up nose of" , "Exasperate" , "Stir up anger" , "Irk" , "Anger, annoy" .)

I've seen this clue in the Evening Standard.

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