Offers part of the rolling stock (7)
I believe the answer is:
tenders
'offers' is the definition.
(I know this)
'part of the rolling stock' is the wordplay.
I cannot quite understand how this works, but
'part' could be 'end' (end is a kind of part) and 'end' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tenders that I've seen before include "Supply ships" , "Bids" , "They provide supplies to other ships" , "Dinghies towed by ships" , "Offers to do work for a stated amount" .)