More lively PE initially performed by seaside feature (7)

I believe the answer is:

peppier

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'more lively' is the definition.
('peppy' can be similar in meaning to 'lively')

'pe initially performed by seaside feature' is the wordplay.
'initially' indicates taking the first letters.
'by seaside feature' becomes 'pier' (I can't justify this - if you can you should believe this answer much more).
The first letter of 'performed' is 'p'.
'pe'+'p'+'pier'='PEPPIER'

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I've seen this clue in The Times.

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