Wobbly toilet seat with half missing (5)
I believe the answer is:
loose
'wobbly' is the definition.
(I've seen this before)
'toilet seat with half missing' is the wordplay.
'toilet seat' becomes 'ose' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'half' means to take half the letters.
'missing' becomes 'lost' (similar in meaning).
'lost' cut in half is 'lo'.
'ose' after 'lo' is 'LOOSE'.
Can you help me to learn more?
(Other definitions for loose that I've seen before include "Lax or at large" , "Not secured" , "Slack; not exact" , "Not firmly fixed" , "Release" .)