Concrete over yard with it inside - it's true (7)
I believe the answer is:
reality
'it's true' is the definition.
I can't judge whether this defines the answer.
'concrete over yard with it' is the wordplay.
'concrete' becomes 'real' (similar in meaning).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'yard' becomes 'y' (abbreviation).
'with' means one lot of letters go next to another.
'y' after 'it' is 'ity'.
'real' put next to 'ity' is 'REALITY'.
'inside' acts as a link.
Can you help me to learn more?
(Other definitions for reality that I've seen before include "Type of television" , "The way things actually are" , "Truth, actuality" , "The world as it is" , "State of things as they actually exist" .)