American president awfully boring (10)
I believe the answer is:
pedestrian
'boring' is the definition.
(I've seen this before)
'american president awfully' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'awfully' indicates an anagram.
'a'+'president'='apresident'
'apresident' is an anagram of 'PEDESTRIAN'.
(Other definitions for pedestrian that I've seen before include "Boring" , "footman" , "Dull, uninspired" , "Run-of-the mill" , "chap on zebra could be?" .)