Irregular way to get the horse out? (8)
I believe the answer is:
unstable
'irregular' is the definition.
(thesaurus)
'way to get the horse out?' is the wordplay.
'way to get' becomes 'st' (I've seen this in other clues).
'the horse' becomes 'unable' (I can't justify this - if you can you should give a lot more credence to this answer).
'out?' means one lot of letters goes inside another.
'st' placed into 'unable' is 'UNSTABLE'.
Can you help me to learn more?
(Other definitions for unstable that I've seen before include "Prone to change" , "Ban lutes (anag.)" , "Likely to collapse" , "Shaky" , "Not steady, volatile" .)