Pushing, being in debt to support English pound (8)

'pushing' is the definition.
(elbowing is a kind of pushing)

'in debt to support english pound' is the wordplay.
'in debt' becomes 'owing' (I've seen this before).
'to support' means one lot of letters go next to another (in a down clue, some letters hold others up).
'english' becomes 'e' (abbreviation).
'pound' becomes 'lb' ('lb' can be a synonym of 'pound').
'e'+'lb'='elb'
'owing' after 'elb' is 'ELBOWING'.

'being' acts as a link.