Love that is rock solid inside (7)
I believe the answer is:
idolise
'love' is the definition.
('love'->'idolize' is in my internal thesaurus and 'ize'->'ise')
'that is rock solid inside' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'rock' indicates anagramming the letters (the solver must 'rock' the letters around).
'inside' indicates putting letters inside.
'solid' is an anagram of 'dolis'.
'ie' enclosing 'dolis' is 'IDOLISE'.
(Other definitions for idolise that I've seen before include "Make into a figure of worship" , "Worship to extremes" , "Worship extravagantly" , "Doilies to worship" , "Pay excessive attention to" .)