Skill I required during friendly, to a certain extent (9)
I believe the answer is:
partially
'to a certain extent' is the definition.
I can't tell whether this definition defines the answer.
'skill i required during friendly' is the wordplay.
'skill' becomes 'art' (I've seen this before).
'required' is a charade indicator (letters next to each other).
'during' is an insertion indicator.
'friendly' becomes 'pally' ('pally' can be similar in meaning to 'friendly'**).
'art'+'i'='arti'
'arti' placed into 'pally' is 'PARTIALLY'.
Can you help me to learn more?
(Other definitions for partially that I've seen before include "to a limited extent" , "not entirely?" , "a bit" .)