Perform some magic showing off pal's castle (4,1,5)

I believe the answer is:

cast a spell

'perform some magic' is the definition.
(I've seen this in another clue)

'off pal's castle' is the wordplay.
'off' indicates anagramming the letters.
'pals'+'castle'='palscastle'
'palscastle' is an anagram of 'CAST A SPELL'.

'showing' is the link.

I've seen this clue in The Irish Times.

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