Beginning to drive in VW is hard for one in tank? (8)
I believe the answer is:
goldfish
'one in tank?' is the definition.
'beginning to drive in vw is hard' is the wordplay.
'beginning to' indicates taking the first letters.
'in' means one lot of letters goes inside another.
'vw' becomes 'golf' (type of Volkswagen car).
'hard' becomes 'h' (abbreviation used in pencil classifications).
The initial letter of 'drive' is 'd'.
'd' placed within 'golf' is 'goldf'.
'goldf'+'is'+'h'='GOLDFISH'
'for' is the link.
(Other definitions for goldfish that I've seen before include "Bowl or pond dweller" , "Fairground prize" , "one enjoying pond life?" , "Swimmer in a bowl" , "he may go round in a tank" .)