By all means, turn up (2,5)

I believe the answer is:

go ahead

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'by all' is the definition.
I can't judge whether this defines the answer.

'turn up' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'up' becomes 'ahead' (similar in meaning).
'go'+'ahead'='GO-AHEAD'

'means' is the link.

Can you help me to learn more?

(Other definitions for go ahead that I've seen before include "Enterprisingly progressive" , "Permission to proceed" , "Up-and-coming -- authorisation" , "Lead" , "OK" .)

I've seen this clue in The Daily Express.

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