Bother to tell you which tweed it is (6)
I believe the answer is:
harass
'bother' is the definition.
(harassing is a kind of bothering)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for harass that I've seen before include "hound" , "bug" , "Disturb < badger" , "Make repeated attacks on" , "Annoy or badger constantly" .)