It pulls a structure to a great height (5)
I believe the answer is:
tower
'a great height' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'it pulls a structure' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'pulls a structure' becomes 'ower' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'ower'='TOWER'
'to' is the link.
Can you help me to learn more?
(Other definitions for tower that I've seen before include "Campanile, for example" , "Stand very high (over)" , "Minaret, for example" , "Drawer" , "Steeple" .)