Choose, as from ideas following last month (6)
I believe the answer is:
decide
'choose' is the definition.
(I've seen this before)
'as from ideas following last month' is the wordplay.
'from' indicates named letters should be taken away.
'following' means one lot of letters go next to another.
'last month' becomes 'dec' (short for December, last month of the year).
'ideas' with 'as' removed is 'ide'.
'ide' after 'dec' is 'DECIDE'.
(Other definitions for decide that I've seen before include "Resolve or give a judgment" , "Choose" , "Reach a judgment" , "Determine - settle" , "Adjudicate" .)