The supporter can get a pair for about lb50 (6)
I believe the answer is:
pillar
'the supporter' is the definition.
(pillars support - hold up - structures)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pillar that I've seen before include "Vertical stone support" , "Column; admired member (of community)" , "Upright column" , "Tall support" , "Building support" .)