A scolding for the traveller on the roof (7)
I believe the answer is:
reproof
'a scolding' is the definition.
(I've seen this before)
'traveller on the roof' is the wordplay.
'traveller' becomes 'rep' (travel company worker).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'rep'+'roof'='REPROOF'
'for the' is the link.
(Other definitions for reproof that I've seen before include "Ticking off" , "Once more get water-resistant" , "what mac no longer keeping one dry needs?" , "Rebuke" , "Reprimand" .)