It may carry bricks intended ultimately to shore up house (3)
I believe the answer is:
hod
'it may carry bricks' is the definition.
The definition suggests a singular noun which matches the answer.
'intended ultimately to shore up house' is the wordplay.
'ultimately' says to take the final letters.
'to' means one lot of letters go next to another (I've seen this in other clues).
'shore up house' becomes 'ho' (I can't explain this - if you can you should give a lot more credence to this answer).
The final letter of 'intended' is 'd'.
'd' after 'ho' is 'HOD'.
Can you help me to learn more?
(Other definitions for hod that I've seen before include "Bricklaver's carrier of orthodox kind" , "Brickie's carrier" , "V-shaped box on a pole for bricks" , "Brick carrier of shoddy type" , "Trough on pole for carrying bricks" .)