Mentioned chap's hot tourist attraction (6)
I believe the answer is:
geyser
'hot tourist attraction' is the definition.
(a geyser is a hot spring)
'mentioned chap's' is the wordplay.
'mentioned' indicates a 'sounds like' (homophone) clue.
'chap' becomes 'geezer'.
'geezer' is a homophone of 'GEYSER'.
(Other definitions for geyser that I've seen before include "A jet of hot water from natural spring" , "spouter!" , "Steaming spring" , "A spring sending up columns of hot water" , "Spring that spouts hot water" .)