A £50 rate, working on the side (7)
I believe the answer is:
lateral
'on the side' is the definition.
(lateral means located on the side)
'a ps50 rate working' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
an anagram of 'rate' is 'tera' which is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lateral that I've seen before include "Shoot" , "Tall ear (anag.)" , "Possibly right" , "Relating to the side" , "One type of thinking" .)