Pleasant month in excellent Tuscan island to the west (7)
I believe the answer is:
amiable
'pleasant' is the definition.
(thesaurus)
'month in excellent tuscan island to the west' is the wordplay.
'month' becomes 'M' (standard abbreviation).
'in' means one lot of letters goes inside another.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'tuscan island' becomes 'elba' (I've seen this in another clue).
'to the west' says the letters should be written in reverse (letters written right to left or \'east to west\').
'elba' in reverse letter order is 'able'.
'm' put into 'ai' is 'ami'.
'ami'+'able'='AMIABLE'
(Other definitions for amiable that I've seen before include "'Friendly, pleasant and good-tempered (7)'" , "Good-humoured" , "Charming" , "'Cordial, friendly (7)'" , "Of sweet and friendly disposition" .)