Crossword Genius

Cube may impede progress (5)

Ross

I believe the answer is:

block

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

This clue could be a double definition.

'cube' is the first definition.
(synonyms)

'impede progress' is the second definition.
'block' can be an answer for 'impede' (blocking is a kind of impeding). I am unsure of the 'progress' bit.

'may' is the link.

Can you help me to learn more?

(Other definitions for block that I've seen before include "Jam" , "Solid lump" , "Cube" , "Impede, prevent" , "City area; prevent flow" .)

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