Enjoy attempt at demo - it fails! (4,1,4,4)

I believe the answer is:

have a good time

'enjoy' is the definition.

'attempt at demo it fails' is the wordplay.
'attempt' becomes 'haveago' (to have a go at something is to attempt it).
'at' means one lot of letters go next to another.
'fails' is an anagram indicator (I've seen 'failed' mean this).
'demo'+'it'='demoit'
'demoit' is an anagram of 'odtime'.
'haveago'+'odtime'='HAVE A GOOD TIME'

(Another definition for have a good time that I've seen is " A hot video game (anag) - enjoy yourself".)

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