Sport finishing early charges not quite a full shilling, conditions irrelevant (3,7)

I believe the answer is:

all-weather

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

'sport finishing early charges not quite a full shilling' is the definition.
I can't tell whether this defines the answer.

'conditions irrelevant' is the wordplay.
I cannot really see how this works, but
'conditions' could be 'weather' (I've seen this before) and 'weather' is found in the answer.
The remaining letters 'all' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for all-weather that I've seen is " Sort of track".)

I've seen this clue in The Telegraph.

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