Do such tactics suit holdup men? (8)

I believe the answer is:

delaying

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'do such tactics suit holdup men?' is the definition.
I can't judge whether this defines the answer.

'holdup men?' is the wordplay.
'holdup' becomes 'delay' (synonyms).
'men?' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'delay'+'ing'='DELAYING'

Can you help me to learn more?

(Another definition for delaying that I've seen is " Postponing".)

I've seen this clue in the Evening Standard.

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