American married sweetheart there without her right instrument? (7)
I believe the answer is:
ammeter
'instrument?' is the definition.
(ammeter is a kind of instrument)
'american married sweetheart there without her right' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'married' means one lot of letters go next to another.
'sweetheart' becomes 'mme' (I can't justify this - if you can you should believe this answer much more).
'without' suggests deleting specific letters.
'right' becomes 'r' (common abbreviation).
'there' with 'her' taken out is 'te'.
'a'+'mme'+'te'+'r'='AMMETER'
Can you help me to learn more?
(Other definitions for ammeter that I've seen before include "Current-measurer" , "Device that measures the flow of electrical current" , "Electric current measurer" , "Current-measuring instrument" , "Instrument to measure electric current" .)