Crossword Genius

Container mostly problematic for spiny shrub (8)

Ross

I believe the answer is:

boxthorn

'spiny shrub' is the definition.

'container mostly problematic' is the wordplay.
'container' becomes 'box' (box is a kind of container).
'mostly' means to remove the last letter.
'problematic' becomes 'thorny' (I've seen this before).
'thorny' with its last letter taken off is 'thorn'.
'box'+'thorn'='BOXTHORN'

'for' acts as a link.

I've seen this clue in The Times.
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