Most attractive types, those basking on the beach, lapping up temperature (8)

I believe the answer is:

stunners

'most attractive types' is the definition.
(stunning people)

'those basking on the beach lapping up temperature' is the wordplay.
'those basking on the beach' becomes 'sunners' (sunbathers).
'lapping up' means one lot of letters goes inside another (to lap up is to drink or consume).
'temperature' becomes 't' (abbreviation).
'sunners' enclosing 't' is 'STUNNERS'.

(Another definition for stunners that I've seen is " beauties".)

I've seen this clue in The Guardian.

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