Time wasted securing building material, short by one tile (9)

'time wasted securing building material short by one tile' is the definition.
I can't tell whether this definition defines the answer.

'time wasted securing building material short by one' is the wordplay.
'wasted' is an anagram indicator.
'securing' means one lot of letters goes inside another.
'building material' becomes 'brick' (brick is a kind of building material).
'short' means to remove the last letter.
'by one' becomes 'a' (a thing is one thing. I am not sure about the 'by' bit.).
'time' is an anagram of 'imte'.
'brick' with its final letter taken away is 'bric'.
'bric'+'a'='brica'
'imte' placed around 'brica' is 'IMBRICATE'.

Can you help me to learn more?