We are discovered moving Shiite jug at start of prayer (3,3,2,2)

I believe the answer is:

the jig is up

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'we are' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'moving shiite jug at start of prayer' is the wordplay.
'moving' indicates anagramming the letters (letters are moved around).
'at start of' indicates taking the first letters.
The initial letter of 'prayer' is 'p'.
'shiite'+'jug'='shiitejug'
'shiitejug' anagrammed gives 'thejigisu'.
'thejigisu'+'p'='THE JIG IS UP'

'discovered' is the link.

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I've seen this clue in The Independent.

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