Does it give lenses a floral tint? (5)

I believe the answer is:

bloom

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'tint?' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bloom that I've seen before include "Open" , "Blossom, flower" , "(Come into) flower" , "Flourish" , "Coat (lens); flower" .)

I've seen this clue in the Evening Standard.

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