American President covers oddly easy attacks (8)

'attacks' is the definition.
(ambush is a kind of attack)

'american president covers oddly easy' is the wordplay.
'american' becomes 'Am' (abbreviation in some contexts).
'president' becomes 'bush' (George H W Bush or George W Bush).
'covers' is a charade indicator (letters next to each other).
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternating letters of 'easy' are 'es'.
'am'+'bush'+'es'='AMBUSHES'