Powerful jamming features intermittent bugle (10)

I believe the answer is:

bullocking

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'powerful jamming features intermittent bugle' is the definition.
I can't tell whether this definition defines the answer.

'jamming features intermittent bugle' is the wordplay.
'jamming' becomes 'blocking' (blocking is a kind of jamming).
'features' means one lot of letters goes inside another.
'intermittent' means one should take alternating letters.
The alternate letters of 'bugle' are 'ul'.
'blocking' placed around 'ul' is 'BULLOCKING'.

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I've seen this clue in the Sydney Morning Herald.

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