1d. Losing idle month in cloister, behind time for putting in columns(10)
36d. Seriously please German navy,labelled ruthless(10 hyphenated) Cold-
hard-
79d. Say, count carrots at one bad meal (10)
90d yes it starts with B - defn is after
36d labelled is superfluous and yes it starts hard...
79d meal is superfluous count is the defn (not 1,2,3,4,5 ... the other count.) and it's an anagram