Provide support, but cause some delay (6)

I believe the answer is:

holdup

I'm a little stuck... Click here to teach me more about this clue!

'some delay' is the definition.
(synonyms)

'provide support but cause' is the wordplay.
I cannot really see how this works, but
'support' could be 'hold' (synonyms) and 'hold' is found in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish News.

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