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When, annually, the interest charged is one pound? (5)

Ross

I believe the answer is:

april

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

'when annually' is the definition.
I can't judge whether this definition defines the answer.

'interest charged is one pound?' is the wordplay.
'interest' becomes 'pri' (I can't justify this - if you can you should believe this answer much more).
'charged' is an insertion indicator (charged can mean filled with).
'is one' becomes 'a' (a thing is one thing).
'pound?' becomes 'L' (the pound sign is based on an L).
'a'+'l'='al'
'pri' going into 'al' is 'APRIL'.

'the' acts as a link.

Can you help me to learn more?

(Other definitions for april that I've seen before include "4th month" , "Girl" , "whose first date is foolish?" , "Thirty days in spring" , "Traditionally showery month" .)

I've seen this clue in the Evening Standard.
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