Presses tropical islands to protect butterfly, perhaps (10)

'presses' is the definition.
(presses of buttons on a keyboard)

'tropical islands to protect butterfly perhaps' is the wordplay.
'tropical islands' becomes 'keys' (key can mean a small island or reef).
'to protect' indicates putting letters inside.
'butterfly perhaps' becomes 'stroke' (butterfly stroke is a swimming stroke).
'keys' enclosing 'stroke' is 'KEYSTROKES'.