Plugs more suitable to insert — perhaps these? (8)

'these?' is the definition.
The definition suggests an adverb but the answer is not.

'plugs more suitable to insert' is the wordplay.
'plugs' becomes 'ads' (advertisements plug products).
'more suitable' becomes 'apter' (more apt).
'to insert' indicates putting letters inside.
'ads' placed around 'apter' is 'ADAPTERS'.

'perhaps' is the link.

Can you help me to learn more?