لْيَدْعُ

فَلْيَدْعُ is a verbal sentence (الجُمْلَةُ الفِعْلِيَّةُ), a jussive particle and a jussive verb

SentenceParticle / VerbVerbParticleParticle
الجُمْلَةُ الفِعْلِيَّةُحَرْفٌ جَزْمٌ وَفِعْلٌ مَجْزُوْمٌفِعْلٌ مُضَارِعٌ مَجْزُوْمٌ بِحَزْفِ النُّوْنِحَرْفٌ جَزْمٌحَرْفُ العَطْفِ 
verbal sentencea jussive verbal sentencea present or future tense jussive verba jussive, imperative particleconjunction 
   
so, let him callفَلْيَدْعُ=يَدْعُلْفَ
so let him callhim callletso
Surah/Below are the 2 verses in the holy Quran containing the compoundلْيَدْعُ
Verb
40-26 
96-17Then let him call upon his councilفَلْيَدْعُ نَادِيَهُ