Spooner’s to ignore indicator for warm weather (8)

I believe the answer is:

sunshine

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

'warm weather' is the definition.
(I know that sunshine is a type of warm weather)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sunshine that I've seen before include "''You are my ..., my only ...'' (song)" , "Solar rays" , "Cheerfulness, daylight" , "In US hens is found this light" , "that appears at dawn" .)

I've seen this clue in The Times.

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