Second insurance worker touring Thailand (7)
I believe the answer is:
instant
'second' is the definition.
(synonyms)
'insurance worker touring thailand' is the wordplay.
'insurance' becomes 'ins' (business abbreviation).
'worker' becomes 'ant' (worker is a type of ant).
'touring' indicates putting letters inside (tour can mean to go around).
'thailand' becomes 'T' (abbreviation on car registration plates).
'ins'+'ant'='insant'
'insant' going around 't' is 'INSTANT'.
(Other definitions for instant that I've seen before include "Split second" , "Short moment" , "Immediate; moment in time" , "Fast, flash" , "Mo" .)