Great Tudors out to recruit English soldiers (10)
I believe the answer is:
tremendous
'great' is the definition.
(thesaurus)
'tudors out to recruit english soldiers' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'to recruit' means one lot of letters goes inside another (in the sense of bringing in).
'english' becomes 'e' (abbreviation).
'soldiers' becomes 'men' (I've seen this before).
'tudors' with letters rearranged gives 'trdous'.
'e'+'men'='emen'
'trdous' enclosing 'emen' is 'TREMENDOUS'.
(Other definitions for tremendous that I've seen before include "Terrific" , "Fantastic" , "Excellent; very great" , "large" , "Immense" .)