Collection of rubbish? Difficulty, apparently, about height (9)
I believe the answer is:
scrapheap
'collection of rubbish?' is the definition.
'scrapheap' can be an answer for 'collection' (scrapheap is a kind of collection). I'm not certain of the 'of rubbish?' bit.
'difficulty apparently about height' is the wordplay.
'difficulty' becomes 'scrape' (I've seen this in another clue).
'apparently' becomes 'ap' (I've seen this in other clues).
'about' indicates putting letters inside.
'height' becomes 'h' (abbreviation in geometry).
'scrape'+'ap'='scrapeap'
'scrapeap' placed around 'h' is 'SCRAPHEAP'.
Can you help me to learn more?
(Other definitions for scrapheap that I've seen before include "Pile of discarded metal" , "Where unwanted items end up" , "To which old iron is consigned, for instance" , "Cap phrase about mound of waste material" , "Pile of discards" .)