Money Spanish royal used making concrete (4)
I believe the answer is:
real
'concrete' is the definition.
(associated in meaning)
'money spanish royal used' is the wordplay.
I cannot quite understand how this works, but
'money' could be 'l' (L can mean 'pounds') and 'l' is present in the answer.
'royal' could be 'r' (common abbreviation e.g. RM - Royal Marine) and 'r' is found within the answer.
The remaining letters 'ea' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'making' acts as a link.
Can you help me to learn more?
(Other definitions for real that I've seen before include "Actual, not illusory" , "Lear, strangely, could actually exist" , "foreign currency" , "Existing, not imaginery" , "Physically existing" .)