Crossword Genius

Given a bell polished under pressure (6)

Ross

I believe the answer is:

phoned

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

'polished under pressure' is the definition.
Although both the answer and definition are past participle verbs, I don't see how one could define the other.

'given a bell' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is located in the answer.
The remaining letters 'phd' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for phoned that I've seen before include "Called" , "Rang" .)

I've seen this clue in The Times.
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