By getting out of line, you want support (4)
I believe the answer is:
pier
'want support' is the definition.
'pier' can be an answer for 'support' (pier is a kind of support). I'm unsure of the 'want' bit.
'by getting out of line you' is the wordplay.
'by' becomes 'per' (I've seen this in another clue).
'getting out of' is an insertion indicator (to be outside something can mean to be around it).
'line you' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'per' going around 'i' is 'PIER'.
Can you help me to learn more?
(Other definitions for pier that I've seen before include "Seaside resort feature" , "Seaside structure" , "Break-water or landing stage" , "Coastal platform" , "Mole, wall between windows" .)