On the phone to sweetheart in Kerry with writer's block?
I believe the answer is:
keypad
'on the phone' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'sweetheart in kerry with writer's block?' is the wordplay.
'sweetheart in kerry' becomes 'key' (I can't justify this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'writer's block?' becomes 'pad' (I've seen this before).
'key'+'pad'='KEYPAD'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for keypad that I've seen before include "Mobile phone provides this" , "Device for data entry" , "What might help you calculate" , "Feature used to operate a portable electronic device" , "In control, buttoned up" .)