Over heads of slips, inaccurate drive finally gets runs for willow (5)
I believe the answer is:
osier
'willow' is the definition.
(osier is a kind of willow)
'over heads of slips inaccurate drive finally gets runs' is the wordplay.
'over' means one lot of letters goes inside another.
'heads of' indicates taking the first letters.
'finally' suggests the final letters.
'gets runs' becomes 'or' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letters of 'slips inaccurate' is 'si'.
The last letter of 'drive' is 'e'.
'si'+'e'='sie'
'sie' put within 'or' is 'OSIER'.
'for' is the link.
Can you help me to learn more?
(Other definitions for osier that I've seen before include "Willow growing shoots used in basketwork" , "Wood" , "one used to get weaving?" , "Tree - Rosie (anag)" , "Withy" .)