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Drug given to cross flipping Art actor with no lines? (5)

Ross

I believe the answer is:

extra

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'actor with no lines?' is the definition.
I can't tell whether this definition defines the answer.

'drug given to cross flipping art' is the wordplay.
'drug given' becomes 'e' (E is another name for ecstasy. I am not sure about the 'given' bit.).
'to cross' becomes 'x' (X is cross-shaped).
'flipping' shows that the letters should be reversed in order.
'art' in reverse letter order is 'tra'.
'e'+'x'+'tra'='EXTRA'

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Not a hit certainly" , "Run scored but not off the bat" , "An additional thing" , "One playing small part" , "Bit actor in film" .)

I've seen this clue in The Independent.
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