Sultry redhead swallowed by the current (8)
I believe the answer is:
tropical
'sultry' is the definition.
(synonyms)
'redhead swallowed by the current' is the wordplay.
'redhead' becomes 'r' (the head/first letter of 'red').
'swallowed by' indicates putting letters inside.
'the current' becomes 'topical' (I've seen this in another clue).
'r' placed within 'topical' is 'TROPICAL'.
(Other definitions for tropical that I've seen before include "Hot and humid, as north and south of the equator" , "rainforest areas" , "Describes weather that is hot and humid" , "April-Oct, unusually humid and very hot" , "Of regions north and south of the Equator" .)