Lacking capacity to accommodate six - it just won't work (8)
I believe the answer is:
unviable
'lacking capacity to accommodate six it just won't work' is the definition.
I can't tell whether this definition defines the answer.
'lacking capacity to accommodate six' is the wordplay.
'lacking capacity' becomes 'unable' (I've seen this in another clue).
'to accommodate' means one lot of letters goes inside another.
'six' becomes 'VI' (Roman numerals).
'unable' placed around 'vi' is 'UNVIABLE'.
Can you help me to learn more?
(Other definitions for unviable that I've seen before include "Not workable" , "Not going to work" .)