Dogs you upset beginning to howl in land by manor? (10)
I believe the answer is:
greyhounds
'dogs' is the definition.
(greyhound is a kind of dog)
'you upset beginning to howl in land by manor?' is the wordplay.
'you' becomes 'ye' (historical version of 'you').
'upset' is a reversal indicator.
'beginning to' suggests taking the first letters.
'in' means one lot of letters goes inside another.
'land by manor?' becomes 'grounds' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The initial letter of 'howl' is 'h'.
'ye' written backwards gives 'ey'.
'ey'+'h'='eyh'
'eyh' placed inside 'grounds' is 'GREYHOUNDS'.
Can you help me to learn more?
(Another definition for greyhounds that I've seen is " Dogs bred for racing".)