Anger of traveller bumped into when reversing (6)
I believe the answer is:
temper
'anger' is the definition.
(temper is a kind of anger)
'traveller bumped into when reversing' is the wordplay.
'traveller' becomes 'rep' (travel company worker).
'bumped into' becomes 'met' (I've seen this before).
'when reversing' shows that the letters should be reversed in order.
'rep'+'met'='repmet'
'repmet' reversed gives 'TEMPER'.
'of' acts as a link.
(Other definitions for temper that I've seen before include "Mood (often bad)" , "Moderate or soften the effects of" , "Volatile anger - don't lose it" , "Toughen by gradually heating and cooling" , "Make hard by heating and cooling, like iron" .)