Crossword Genius

Pound to fill a poem with it (1,2,4)

Ross

I believe the answer is:

a la mode

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

'with it' is the definition.
(I've seen this before)

'pound to fill a poem' is the wordplay.
I cannot really understand how this works, but
'pound' could be 'l' (abbreviation e.g. Lsd - pounds, shillings, pence) and 'l' is present in the answer.
'a' is present in the answer.
'poem' could be 'ode' (ode is a kind of poem) and 'ode' is found within the answer.
The remaining letters 'am' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for a la mode that I've seen before include "In fashion - served with ice cream" , "Fashionable -- served with ice cream" , "all the rage" , "stewed with veg?" , "In the current fashion" .)

I've seen this clue in The Sun and The Times.
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