Bad weather encountered on way back? A nuisance (7)
I believe the answer is:
tempest
'bad weather' is the definition.
(tempest is a kind of bad weather)
'encountered on way back? a nuisance' is the wordplay.
'encountered' becomes 'met' ('meet' can be a synonym of 'encounter').
'on way back?' is a reversal indicator (I've seen 'on way back' mean this).
'a nuisance' becomes 'pest' (I've seen this before).
'met' written backwards gives 'tem'.
'tem'+'pest'='TEMPEST'
(Other definitions for tempest that I've seen before include "violent uproar" , "A great storm of wind and rain" , "terrible blow" , "Violent storm (created by Shakespeare?)" , "Violent windy storm" .)