Sun protection factor over 50 if one gets burnt (6)

Guardian Cryptic #29265 | 5 Across | 2023-12-29
Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

An envelope (‘over’) of L (Roman numeral, ’50’) plus ‘if’ in SPF (‘Sun Protection Factor’ – a standard abbreviation).

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