Find right area and lines around it (6)
I believe the answer is:
rarity
'find' is the definition.
(I've seen this before)
'right area and lines around it' is the wordplay.
'right' becomes 'r' (common abbreviation).
'area' becomes 'a' (maths abbreviation).
'and' says to put letters next to each other.
'lines' becomes 'ry' (abbreviation for railway).
'around' means one lot of letters goes inside another.
'ry' going around 'it' is 'rity'.
'r'+'a'+'rity'='RARITY'
(Other definitions for rarity that I've seen before include "Unusual specimen" , "Infrequent occurrence" , "Uncommon item or event" , "Something very scarce and often valuable" , "could be something of value" .)