Art arranged in row for convenience (7)
I believe the answer is:
latrine
'convenience' is the definition.
(latrine is a kind of convenience)
'art arranged in row' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'in' is an insertion indicator.
'row' becomes 'line' (as in a row of things).
'art' is an anagram of 'atr'.
'atr' placed within 'line' is 'LATRINE'.
'for' acts as a link.
(Other definitions for latrine that I've seen before include "A military lavatory" , "Camp toilet" , "An army loo" , "Reliant on military loo" , "where to go in the army" .)