Smiley perhaps regularly found in Exmoor jail (5)

I believe the answer is:

emoji

'smiley perhaps' is the definition.
(I know that smiley is a type of emoji)

'regularly found in exmoor jail' is the wordplay.
'regularly found in' means one should take alternating letters.
'exmoor'+'jail'='exmoorjail'
The alternate letters of 'exmoorjail' are 'EMOJI'.

(Another definition for emoji that I've seen is " Graphic expression".)

I've seen this clue in The Telegraph.

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