Unpredictable scoundrel housed in Morecambe? (7)
I believe the answer is:
erratic
'unpredictable' is the definition.
(synonyms)
'scoundrel housed in morecambe?' is the wordplay.
'scoundrel' becomes 'rat' (I've seen this in other clues).
'housed in' means one lot of letters goes inside another.
'morecambe?' becomes 'eric' (comedian Eric Morecambe).
'rat' placed inside 'eric' is 'ERRATIC'.
(Other definitions for erratic that I've seen before include "Irregular or uneven in movement or habit" , "Shifting, unpredictable" , "Uneven in movement or quality" , "Irregular - eccentric" , "Irregular in pattern or movement" .)