Papers are into where one can go around Oval? (6)

'oval?' is the definition.

'papers are into where one can go around' is the wordplay.
'papers' becomes 'id' (identification papers).
'are' becomes 'a' (the 'are' is a metric unit of area).
'into' means one lot of letters goes inside another.
'where one can go' becomes 'loo' ('go' can mean 'urinate').
'around' says the letters should be written backwards.
'loo' reversed gives 'ool'.
'id'+'a'='ida'
'ida' inserted into 'ool' is 'OOIDAL'.