Noble ground? (5)
I believe the answer is:
lords
'noble ground?' is the definition.
'lords' can be an answer for 'ground?' (I've seen this before). I'm not sure about the 'noble' bit.
'noble ground?' is the wordplay.
'noble' becomes 'lord' (synonyms).
'ground?' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'lord'+'s'='LORDS'
Can you help me to learn more?
(Other definitions for lords that I've seen before include "Headquarters of the MCC" , "Peers at the cricket ground" , "Test cricket ground" , "another place for an MP" , "Parliamentary house" .)