One retiring clergyman in outhouse shook convulsively (8)
I believe the answer is:
shivered
'shook convulsively' is the definition.
'shivered' can be an answer for 'shook' (I've seen this before). I'm not certain of the 'convulsively' bit.
'one retiring clergyman in outhouse' is the wordplay.
'one' becomes 'i' (Roman numeral).
'retiring' shows that the letters should be reversed in order.
'clergyman' becomes 'rev' (I've seen this before).
'in' is an insertion indicator.
'outhouse' becomes 'shed' (I've seen this in other clues).
'rev' written backwards gives 'ver'.
'i'+'ver'='iver'
'iver' placed inside 'shed' is 'SHIVERED'.
Can you help me to learn more?
(Other definitions for shivered that I've seen before include "'Trembled, with cold or fear (8)'" , "Shook" , "showed signs of cold" , "Trembled, with cold say" .)