After short space nobleman and monarch meet (9)
I believe the answer is:
encounter
'meet' is the definition.
(synonyms)
'after short space nobleman and monarch' is the wordplay.
'after' means one lot of letters go next to another.
'short space' becomes 'en' (typographical space as wide as an 'n').
'nobleman' becomes 'count' (count is a kind of nobleman).
'and' says to put letters next to each other.
'monarch' becomes 'ER' (abbreviation for Elizabeth Regina, British Queen).
'en'+'count' is 'encount'.
'encount'+'er'='ENCOUNTER'
(Other definitions for encounter that I've seen before include "See 19" , "Run into - combat" , "tackle" , "Meet by chance with encore nut" , "Come upon, meet" .)