It's striking when we cover it in white (3)

I believe the answer is:

hit

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

'it's striking' is the definition.
(synonyms)

'we cover it in white' is the wordplay.
'HIT' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'when' is the link.

Can you help me to learn more?

(Other definitions for hit that I've seen before include "Strike, clout" , "turkey? No" , "Visit to website" , "not to miss!" , "Successful record" .)

I've seen this clue in the Evening Standard.

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