Leisurely moo in field getting loud at the end (4-5)

'leisurely' is the definition.
(thesaurus)

'moo in field getting loud at the end' is the wordplay.
'moo' becomes 'low' (low can mean to make a mooing sound).
'in field' becomes 'space' (both can mean an area or environment. I am not sure about the 'in' bit.).
'getting' means one lot of letters goes inside another.
'at the end' indicates one should take the final letters.
The final letter of 'loud' is 'd'.
'low' put within 'space' is 'slowpace'.
'slowpace'+'d'='SLOW-PACED'

Can you help me to learn more?