Relief when one gets into pole position (10)
I believe the answer is:
assistance
'relief' is the definition.
(thesaurus)
'when one gets into pole position' is the wordplay.
'when' becomes 'as'.
'one' becomes 'i' (Roman numeral).
'gets into' indicates putting letters inside.
'pole' becomes 's'.
'position' becomes 'stance' (stance is a kind of position**).
's'+'stance'='sstance'
'i' put within 'sstance' is 'sistance'.
'as'+'sistance'='ASSISTANCE'
(Other definitions for assistance that I've seen before include "Support" , "Help" , "Aid" .)