Crossword Genius

Lens care solution? (8)

Ross

I believe the answer is:

cleanser

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

'solution?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'lens care' is the wordplay.
'lens care' can be anagrammed to 'CLEANSER'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for cleanser that I've seen before include "Cleaning cream or lotion" , "Purgative" , "Scan reel (anag.)" , "Eg, detergent" , "this can remove dirty marks" .)

I've seen this clue in The Independent.
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